This circuit was found in the July 1988 issue of Radio Electronics magazine. It makes use of an operational transconductance amplifier (OTA) still in use today.
This crystal-controlled oscillator was obtained from an American 1980s documentation. The circuit...
The battery charger suggested in the figure has its current limited by resistor R1. This component may...
In this circuit, from a 1977 FET documentation, the FET can be BF245 or MPF102. The circuit...